Shadowrun

So in the Campaign I'm running, a players daughter who is a 3 year old Awakened was kidnapped by Aztech to use in an experiment. Now her father is planning a pink mohawk style assault on their pyramid to get her back. What level of difficulty should the security be, given that I dont want the characters to straight up die in the initial assault? Any other tips on managing the scale of combat of this magnitude.

My party has 5-7 players, running the standard character builds from 5e. Please help.